<template>
   <div>Child...
       <button @click="handleClick" >按钮</button>
   </div>
</template>
<script>
export default {
  name: "ChildCommon",
  methods: {
    handleClick() { 
      //this.$emit("xxx");
      //this.$emit("click");
      this.$emit("setNum");
    }
  } 
}
</script>
<style>

</style>